Volume 3, Issue 1 (9-2016)                   jzfr 2016, 3(1): 47-58 | Back to browse issues page

XML Persian Abstract Print

Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Hossieni A, Hossieni M. The Role of Topographic and Edaphic Factors in Mortality of Trees in Middle Zagros Persian Oak (Quercus brantii) Forests. jzfr. 2016; 3 (1) :47-58
URL: http://yujs.yu.ac.ir/jzfr/article-1-51-en.html
Professor, Forests, Rangelands, and Watershed Management Research Department, Ilam Agricultural and Natural Resources Research And Education Center, AREEO, Ilam, Iran , ahmad.phd@gmail.com
Abstract:   (10307 Views)

Oak decline is a complex phenomenon that oak forests are faced with it across the world and Iran. Shalam forested area located in north of Ilam province was selectedto determine the role of topographicand some edaphic factors in tree mortality happened in Persian oak forests. The study region was divided into 20 homogeneous topographic units. Within each homogeneousunit,three 0.1-haplots  were randomly-systematically established for measuring the rate of tree mortality and oneprofile was prepared for characterization ofsome  physical and chemical soil characteristics (texture, moisture content, TNV%, OC% and N for each soil layer, and soil depth). In each plot,diameter at breast height (DBH), maximum and minimum crown diameters, crown dieback percent, origination and form of trees and shrubs for all species and site variables weremeasured. Results showed that 15.7% of forest stock had reduced while 97.65% of it belonged to Persian oak species. The results of multiple linear regression and RDA showed that tree mortality was significantly affected by elevation and aspect, but not by slope. The highestrate of tree mortality was observedin high elevation and south and west aspects. Also the results of multiple linear regression and RDA showed that tree mortality was significantly affected by soil depth and texture. So, the highestrate of tree mortality was observed in soils with less depth, less sand% and more silt%. It was concluded that topography and soil have effective role in tree mortality and its expansion across Zagros forests. Identifying the critical conditions in terms of topography and soil in these forests can help and be useful in the management of tree dieback.

Full-Text [PDF 292 kb]   (617 Downloads)    
Type of Study: Research | Subject: Special

Add your comments about this article : Your username or Email:

Send email to the article author

© 2021 CC BY-NC 4.0 | Zagros Forests Research

Designed & Developed by : Yektaweb